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Short answer; don't.
Based on what you've said it's not that his character is a problem, just that his theoretical goal is untenable. Make it clear to him exactly what sort of trouble he'd be in for if he decides to have his character pursue that vendetta. Let him know it would be impossible (or almost impossible, depending on your GM style) to fulfill and ...

"Hey, that sounds like a great idea for an epic game. We're actually
going to be playing something more low key in this campaign, though.
How about if you have a vendetta against (lower powered authority, but
still powerful relative to the character and more fitting with the
situation)? That would fit in really well this this other
...

Time waits for no Bob.
While he's agonizing over the decision, the world goes on. If the authorities are looking for the body, they continue to get closer to their goal. If the ship is headed somewhere, it continues to get closer to its goal.
Bob can only wait until matters come to a head. Once the authorities get there / another trader finds them / ...

Rogue Trader rulebook would like to have a word with you (page 375):
Servo-skulls are human skulls (often that of a favoured servant or low ranking tech-priest) that have been fitted with rudimentary artificial intelligence, support systems, and an anti-grav motor to provide mobility.
For carrying capacity use the standard rules from page 267 with the ...

There are only two situations in which it is ever appropriate to restrict a player's creativity (especially new players who might get discouraged) when constructing an origin story for their character in an RPG:
The origin story gives a player a mechanical advantage over the other players. Example: My noble family is old, influential, and extremely ...

Space marines carry out constant trials to find the best of the best on dozens of worlds, those that pass the first test are taken to the home worlds and further tested to make sure no one got through with just a passing grade.
Form there it takes one year to produce a space marine using lost technology, all of which the candidate spends unconscious as ...

I would say : NO.
The Servo Skull is a hollowed out skull, brain is only held "working" by a cognitator, and the AI is the one that is controlling the skull. It might have some resemblance to it's previous owner, it might even feel "haunted" by his spirit, but the object itself is just a robotic utility.
You will have as much result with as putting Vox on ...

DIY Astartes, or So You Want To Play Emperor
First off, I need to stress that this is a VERY BAD IDEA. The Space Marines were made by the Emperor Himself, and making your own would be akin to playing Emperor, which is so much heresy the Inquision would leap onto your ass until your butt resembled an auto-da-fé. Plus, the existing Chapters will NOT like you ...

Traditionally Servo skulls are made from those who are very loyal or very pious, and it is considered a great honour to serve the Emperor in death.
http://wh40k.lexicanum.com/wiki/Servo-skull
I expect your average tech priest would consider using a Xenos to be blasphemy and tech-heresy.
If you are a rogue techpriest or a member of the Dark Mechanicus, ...

Tell him where the problema lies. "Man, your character knows that the target of your revenge is maybe the most well protected guy ever. Do you really want to have such a target, that it might be justification for your partecipation to the story but can't be reached (at least not soon) or would you rather like to choose one of his menas your target?"
Build ...

No tool like this exists for Rogue Trader...
I spent about half an hour searching around on google, forums, and the official Rogue Trader site to see if there was anything approaching what you described and there is not. In fact the only tool of any kind I could find was for star system generation (and everything within)
However, you shouldn't be the one ...

Let's see. In Rogue Trader players are exceptionally powerful merchants with a Warrant of Trade that allows them to explore the unknown, exploit worlds, buy and sell extraordinary raw materials and powerful devices, as weapons. So, it seems that the primary goal is:
Cash
Well, not only cash, also power, contracts, devices, space ships. You know, your ...

This is a difficulty that comes up in a lot of RPGs actually, including way back in the early editions of D&D (from which Rogue Trader gets its Disengage-to-avoid-bonus-attack rule).
Think of the round as being full of position and weapon maneuvers and potential attacks, but the roll is only made for the pivotal attack opportunity for which all the the ...

Because of what happened to all the cool computers (read Dan Abnett's Dark Mechanicum for the 30K version of this tale) 40K can't suffer even a Commodore 64 to live.
Bottom line, all the parts of the brain that were the person are dead. Some things remain: pattern recognition, short-term memory capacity, but only the barest rudiments, to make it an ...

I think there's no mechanics on that, but it's a matter of personal roleplaying. Surely corruption must affect the character, the question is how it should affect.
Some characters would be becoming more and more evil, maybe without noticing it. Others would be somewhat conscious of their corruption, and will try to fight it or at least hide it. The ...

It seems unlikely. The Dark Eldar seek out ever more extreme stimuli to subject themselves and others to. Any substance that can knock a Dark Eldar unconcious is either incredibly rare, impossible to develop a tolerance against (presumable even with biological augmentation, which the Dark Eldar seem to be into), or so potent a single drop would kill ten ...

It depends on the character's personality. Explorators are sent to explore, recover extremely valuable archeotech and report new forms of life. They're basically that, intrepid explorers, all while being tech-priests.
If your friend has an obsession with the machines it's not bad, as tech-priests are, but if he doesn't focus on the expedition you could say ...

Treat your Skull with Respect
or: the Narrative Answer
So you have an adorable flying robot skull that does whatever you tell it to do, no matter how unpleasant or dangerous, with no complaints or questions. And now it seems to be thinking for itself...
All of this ties closely into a lot of fairly common themes in science fiction - particularly the pulp ...

I don't know RT and only roughly WH40k. That said I still want to propose the following: Talk to your player about how all-mighty the God-Emporer is. Talk about a common definition of "vendetta". Maybe you'll find that the player wants a target that will keep his character running forever.
In this case "vendetta" may mean "my character blames the emporer ...

Just how SevenSidedDie pointed, it takes more than just a gene-seed to create a Space Marine. You need a wide array of organs and implants, and a team of experienced apothecaries, and the process can last for years. Not only that, the reciever of the organs and the gene-seed must be 18 years old at most, and has to be strong enough to survive the drastic ...

I had a group of 4 PCs taken down by two NPCs wielding Power Axes, light armour. One PC named Garret had Power Armor and full health with a man-portable lascannon. I think his BS was 70 and he was famous for taking down several tanks and even War-Walkers.
Another time I had a first time player have a demon intrude on his ship the first time he ever entered ...

our house rule for when a Pc wants pets or servants or what ever is they can only have an amount of pets equal to half there Fel bonus. and that's just us to keep things less complicated, and smooth play.
hope this helps

You should use the one from the system you play in, as has been said.
The reason for the difference in the rule hasn't been mentioned yet, however:
In Only War, bursts are already Half Actions. No need for the talent to do that anymore.

Accoring to the rulebook, armor on same location does not stack. No exceptions can be seen on the shields.
But maybe your GM can be persuaded to go around this with a house rule, knowing that if you carry a shield and armor you suddently become really hard to kill (which i could imagine being your plan.)

Taking a quick glance at the RT Core Rulebook, I believe I have an answer for you for both uses of that spell.
The first use of that spell, if successful, cuts a single target off from most of their senses. They can no longer see, hear, smell, or taste (it is up to the GM whether that also takes away 'feel'). As the living creatures we are, we rely on our ...

The Default Assumption
In Rogue Trader, it is assumed by default that the characters are high-ranking individuals aboard their own voidship; that is operated by a crew numbering in the thousands. Now while that scenario is completely up to the GM's discretion and their campaign story, it does promote that the players' characters have at least a basic ...

Typically, you cannot take the Shooting Action before the Manoeuvre Action. You need a Ship or Ship Component special ability, Psyker or Navigator Power, Talent or Role benefit, or Extended Action that allows you to shoot first and move second in order to do so. As far as I am aware, no published material allows it currently, although I haven't played in a ...

It's actually quite easy. Try to see the whole round AFTER it has happened.
"The elven warrior approaches the chief orc and hits him with his sword. The chief orc sees he is no match for the elf and tries to go away, giving the elf the chance he needed to strike again. Meanwhile, a berserker orc charges the wizard, but the dwarven paladin was only waiting ...

I've played a little Rogue Trader, but am familiar with these ideas, and role playing in a hierarchy. Which is why I would honestly advise solution one, for a few reasons.
Firstly, there may be some 'geographic' challenge to having your Arch-militant fill both the roles of Master-at-Arms and Master of Ordinance. The barracks might not be located near the ...